Process of producing chlorids of aromatic sulfonic acids.



htlTlEH Status AUGUSTUS BISCHLER, OF BASLE, SWITZERLAND, ASSIGNOR TOBASLE CHEMICAL WORKS, OF SAME PLACE.

PROCESS OF PRODUCING CHLORIDS 0F AROMATIC SULFONIC ACIDS.

SPEGIFICATIDN formingpart of Letters Patent No. 667,861, dated February12, 1901.

Application filed August 25.1900. Serial No. 28,014. (No specimens.)

To all 1071/0722 H; In/my concern.-

Be it known that I, AUGUSTUS BISCHLER, chemist and doctor of philosophy,a subject of the Emperor of Russia, and a resident of Basle,Switzerland, have in vented a new Prooess of Manufacturing Chloride ofthe Aromatic Sulfonic Acids, of which the following is a clear andcomplete specification.

I have found that the chlorids of the aromatic sulfonic acids may beobtained with ease and in a pure state by means of the aromatic sulfinicacids by treating these sulfinic acids as such or their salts withchlorin.

Among the aromatic sultinic acids the orthotoluenesulfinic acid, as wellas the ethereal salts of the orthosulfinicbenzoic acid, is speciallyimportant for the preparation of the chlorids, by means of which thepure saccharin is directly obtained. 1 shall therefore only describe theprocess for the preparation of the products resulting from theabovementioned sultinic acids.

By passing chlorin in an aqueous solution of a salt of theorthotoluenesulfinic acid or of the ethereal salts of theorthosulfinicbenzoic acid the respective sulfochlorids are formedaccording to the following formula:

in which X stands for CH or OOOR, respectively, B being in alkyl group.

If the aqueous solutions of the salts of the sulfinic acids areliberated with mineral acids and chlorin is introduced into thesuspension, the chlorids of the sulfonic acid are equally formed,besides the muriatic acid.

Example I: Dissolve ten kilos of orthotoluenesulfinio acid in dilutedcaustic soda.

Into this solution chlorin is introduced until the formation of oilychlorid has ceased. Cool the solution which gets warm by the action ofthe chlorin, separate the orthotoluenesulfochlorid by decantation, andwash it with water. The 0rthotoluenesulfochlorid is also obtained bymixing the above-mentioned solution of the sodium salt of the sulfinicacid with muriatic acid and by passing through the solution (containingsulfinic acid, which is partly dissolved and partly suspended) a strongcurrent of chlorin. By the force of the current of chlorin the solutionis more or less heated; but the temperature should be regulated so asnot to surpass to centigrade.

Example II: The methyl orthosulfinicbenzoate (melting-point 98 to 99centigrade) obtained from the methylic ether of the anthranilic acid hasto be dissolved in the necessary quantity of diluted alkali and must betreated with chlorid according to Example 1. Thus the orthosulfochloridof methyl benzoate is obtained which Will melt at 64 to 65 Centigrade.

Having thus described my invention, I claim- The herein-describedprocess for producing chlorids of the aromatic sulfonic acids, whichconsists in treating the corresponding aromatic sulfinic acids withchlorin, substantially as set forth.

In witness whereof I have hereunto signed my name, this 11th day ofAugust, 1900, in the presence of two subscribing Witnesses.

AUGUSTUS BISOHLER.

Witnesses:

GEO. GIrFoRD, AMAND BITTER.

